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SAN FRANCISCO (AP) _ Yougottawanna, winner of the El Camino Real Derby, has a hairline fracture in a foot bone and won't run in the Kentucky Derby.

Trainer Jerry Hollendorfer said Wednesday that surgery is planned on Yougottawanna, likely to put a screw in to stabilize the pastern bone and help it heal. The horse will need at least three months to heal and could be out of training for five or six months, Hollendorfer said.

The pastern is the part of a horse's foot just above the hoof.

It was unclear how the injury occurred. Those watching him gallop on Tuesday said he did not pull up well, and the fracture was discovered.

``He galloped perfect,'' Hollendorfer said. ``We really don't know what happened.''

Yougottawanna, who was set to run in the Santa Anita Derby on April 6, won the El Camino at Golden Gate Fields on March 9. The 3-year-old gelding is owned in part by Ted Aroney and Sid and Jenny Craig.

Hollendorfer came close to entering a horse in the Derby with Event of the Year in 1998 and Globalize in 2000. But both were injured just days before the race and had to pull out.